Question

我正在制作游戏，我想使用设置单例类。我从互联网上获得了这个代码示例。但是加载这个类有问题。无法理解如何在保存后加载这些属性。

class Settings: NSObject, NSCoding {

static let DocumentDirectory = FileManager().urls(for: .documentDirectory, in: .userDomainMask).first!
static let ArchiveURL = DocumentDirectory.appendingPathComponent("settings")

static let shared = Settings()

var level: Int = 1
var moves: Int = 0
var music: Bool = true 

override init() {
    super.init()
}

required init?(coder aDecoder: NSCoder) {
    level = aDecoder.decodeInteger(forKey: SNames.CurrentLevelSName)
    music = aDecoder.decodeBool(forKey: SNames.MusicSName)
}

func encode(with aCoder: NSCoder) {
    aCoder.encode(level, forKey: SNames.CurrentLevelSName)
    aCoder.encode(music, forKey: SNames.MusicSName)
}

func loadGame() -> Settings? {
    return NSKeyedUnarchiver.unarchiveObject(withFile: Settings.ArchiveURL.path) as? Settings
}

func save() {
    let isSuccessfulSave = NSKeyedArchiver.archiveRootObject(self, toFile: Settings.ArchiveURL.path)
    if !isSuccessfulSave {
        print("Failed to save Settings...")
    }
}

}

Answer 1

如果要获取设置，则必须执行操作，然后才能访问级别，移动和其他属性。这是一些代码。

if let settings = Settings.shared.loadGame() {
    print(settings.level)
}

这将加载设置并打印关卡。

如何加载单例类属性？

1 个答案: